Seed-drill.



No. 770,164. PATBNTED SEPT/13,1904.

R. GOMMIOHAU.

SEED DRILL. APPLICATION FILED AUG. 14, 1903. NO MODEL. I I 2 SHEETSSHEBT 1.

No. 770,164. PATENTED SEPT. 13, 1904.

I R. GOMMICHAU.

SEED DRILL.

nrmoumn FILED AUG. 14,1903. I

NO MODEL. v 2 SHEETS-SHEET 2'.

UNiTEn STATES Patented September 13, 1904.

PATENT OFFICE.

SEED-DRILL.

SPECIFICATION forming part of Letters Patent No. 770,164, dated September 13, 1904.

Application filed August 14, 1903.

To all whom, it may concern:

Be it known that I, RUnoLF CoMMIoHAU, a subject of the Emperor of Germany, residing at Magdeburg-Sudenburg, Germany, haveinvented new and useful Improvements in Seed- Drills, of which the following is a specification.

This invention relates to improvements in seed tubes or conveyers of seed-drills of the kind described in the specification of British Patent No. 19,731 of December 3, 1890.

Seed-tubes made in accordance with the specification of the patent above referred to possess the disadvantage in practice that they canbe somewhat easily expanded or lengthened, in which event the coils or spirals cannot be made to again assume their original positions, whereby the tube becomes more or less useless.

Now this invention has for its object to overcome this disadvantage, and to this end the strip of sheet metal of which the spiral tube is made is provided on its lower edge with an internal -rib,corrugation,or expansion,

a similar but external rib, corrugation, or expansion being sometimes formed along the upper edge of the strip. By forming the spiral tube in this way I prevent the coils being pulled out of engagement with one another without the compression of the tube being in any way hindered,'this being effected by the stifiening of the coiled sheet due to the bending.

To enable the invention to be fully understood, I will describe it by reference to the accompanying drawings, in which Figure 1 isa part-sectional elevation showing the improved seed-tube. Fig. 2 is a vertical section through two of the coils. Fig. 3 is a horizontal section of the tube. Fig. 4

represents the rolled sheet of metal, showing the method of forming the tube. Fig. 5 is a view similar to Fig. 2 of a modified construction of the tube. Fig. 6 is a View similar to Fig. 1 of another method of forming the expansion upon the edges of the sheet metal wherein the top edge is left plain, the lower edge only being expanded. Fig. 7 is a longitudinal sec- Serial No. 169,521. (No model.)

tion illustrating this form of tube. Figs. 8 and 9 are two transverse sections showing two different forms of the expansion. Fig. 10 is a view similar to Fig. 4, showing the tube in course of formation.

Referring first to Figs. 1 to I, the-tube is formed of a metal sheet a, which has provided along its upper edge an external bead, corrugation, or expansion 6 and upon its lower edge the internal expansion, corrugation, or bead 0, these two expansions, corrugations, or beads being made in any desired manner, the said sheet after rolling being coiled, as shown in Fig. 1. Where flat rolled material is employed, a device is utilized for bringing the sheet to the required form before the coiling.

In Fig. 5 I have shown the coiled tube provided around its upper edge with a series of beads, corrugations, or expansions Z) in lieu of one, as shown in Figs. 1 and 2. The effect of this is, however, the same as that of the first-described arrangement.

In Figs. 6 to 10 I have illustrated the tube, in which only the lower edge of the sheet metal is formed with the expansion or corrugation, and this expansion is in the form of the crinkling or corrugation f clearly shown in Figs. 7, 8, and 9, Fig. 9 showing a closer crinkling than that shown in Figs. 7 and 8. It is to be understood, however, that the upper edge may be crinkled or corrugated, if desired, instead of the lower edge.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. A seed-tube formed of a spiral strip of sheet material corrugated adjacent to an edge thereof throughout substantially the entire length of said strip, substantially as described.

2. A seed-tube formed of a spiral strip of sheet material provided with a longitudinal corrugation adjacent to one edge thereof and extending throughout substantially the entire length thereof, substantially as described.

3. A seed-tube formed of a spiral strip of sheet material having an external longitudinal corrugation adjacent to its upper edge and an internal longitudinal corrugation adjacent to its lower edge, said corrugations extending throughout substantially the-entire 5 length of the strip, substantially as described. 4. A seed-tube formed of a spiral strip of sheet material stiffened adjacent to one of its longitudinal edges throughout substantially the entire length of said strip, substantially as described.

RUDOLF COMMIOHAU; Witnesses:

BRUNO WAGNER, GEORG BECKER. 

